Just because it was normal doesnt mean it’s okay people finding him creepy is a good sign because it comes from a place of awareness and good will
Our MC is a 21st century woman and it’s no wonder she doesn’t like him because she also thinks it’s weird for lester to be interested in her when lester first saw her as literal child.
I’d say it’s more surprising that MC isn’t repulsed by knowing lester’s romantic feelings towards her

Some people are finding Lester creepy but let's not forget that this is based off of a time period where 15 year olds were married off to much older partners. It was completely normal.
To Lester this is normal, while to Yuri this is weird. Now that they are both adults I'm kinda rooting for Lester but I already know it's not gonna happen because of aennon